Think about an Earthship's water system Which of these steps happens last? HINT A. Water is used for drinking and washing. B. Water is used to flush toilets. C. Water is collected in storage tanks. D. Water is sent to indoor plants.

## Step 1<br />The problem is asking us to identify the last step in the water system of an Earthship. An Earthship is a type of sustainable habitat that uses renewable resources. The water system in an Earthship involves several steps, which are given as options in the problem.<br /><br />## Step 2<br />The steps in the water system of an Earthship are:<br />1. Water is collected in storage tanks.<br />2. Water is used for drinking and washing.<br />3. Water is used to flush toilets.<br />4. Water is sent to indoor plants.<br /><br />## Step 3<br />From the above steps, we can see that the last step in the water system of an Earthship is "Water is sent to indoor plants". This is because, after the water has been used for drinking, washing, and flushing toilets, it is then sent to indoor plants for reuse.